12643442042 has 32 divisors (see below), whose sum is σ = 24889351680. Its totient is φ = 4666751280.

The previous prime is 12643441991. The next prime is 12643442047. The reversal of 12643442042 is 24024434621.

It is not an unprimeable number, because it can be changed into a prime (12643442047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2157608 + ... + 2163459.

It is an arithmetic number, because the mean of its divisors is an integer number (777792240).

Almost surely, 2^12643442042 is an apocalyptic number.

12643442042 is a deficient number, since it is larger than the sum of its proper divisors (12245909638).

12643442042 is a wasteful number, since it uses less digits than its factorization.

12643442042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4321106.

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 12643442042 its reverse (24024434621), we get a palindrome (36667876663).

The spelling of 12643442042 in words is "twelve billion, six hundred forty-three million, four hundred forty-two thousand, forty-two".